Invisible Soliton Pulsation: Visualizing the “Invisible” Soliton Pulsation in an Ultrafast Laser (Laser Photonics Rev. 14(4)/2020)

In article number 1900317, Wen‐Cheng Xu, Zhi‐Chao Luo, and co‐workers unveil a novel type of soliton pulsation in an ultrafast laser. The observed pulsating dynamics cannot be resolved by routine diagnostic methods because of the almost unchanged energy, which is termed as “invisible” soliton pulsation. Here, a real‐time spectroscopy technique is skillfully applied to identify the newly discovered pulsating dynamics. The cover shows an artistic representation of the pulsating dynamics in both the spectral and temporal domains.